Spell chequer

If you care to look in a copy of The Big Book of Graffiti you will see.
Chapter 1, page 1, rule 1.
If you spray it big spell it right.

This reminded me of a little poem by Martha Snow.

Eye halve a spelling chequer
It came with my pea sea
It plainly marques four my revue
Miss steaks eye kin knot sea.

Eye strike a quay and type a word
And weight four it two say
Weather eye am wrong oar write
It shows me strait a weigh.

As soon as a mist ache is maid
It nose bee fore two long
And eye can put the error rite
It's rare lea ever wrong.

Eye have run this poem threw it
I am shore your pleased two no
It's letter perfect awl the weigh
My chequer tolled me sew.